软磁盘阵列「建议收藏」

软磁盘阵列「建议收藏」磁盘阵列是指通过软件或者硬件的技术来将多个磁盘整合成为一个大的磁盘设备,来实现存储和保护数据的功能。硬件实现的成为硬磁盘阵列,软件实现称为软磁盘阵列,硬件通过磁盘阵列卡上的芯片专门处理raid任务,性能最佳。但由于成本太高大多使用软磁盘阵列,就是mdadm软件,以分区或者磁盘为单位来进行设计。Raid-0(等量模式):将文件内容等量分配到各个磁盘中,大大增强读写速度,但只要硬盘有损坏,将会直接…

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磁盘阵列是指通过软件或者硬件的技术来将多个磁盘整合成为一个大的磁盘设备,来实现存储和保护数据的功能。硬件实现的成为硬磁盘阵列,软件实现称为软磁盘阵列,硬件通过磁盘阵列卡上的芯片专门处理raid任务,性能最佳。但由于成本太高大多使用软磁盘阵列,就是mdadm软件,以分区或者磁盘为单位来进行设计。

Raid-0(等量模式):将文件内容等量分配到各个磁盘中,大大增强读写速度,但只要硬盘有损坏,将会直接造成文件的数据丢失。

Raid-1(镜像模式):将文件同时写入到两块硬盘上,存储量会降低,写性能也会变差,但是读取性能增强,在安全上也有很高的保证

Raid5:类似与raid1但是会在每一块硬盘中添加parity同位校验码,它会记录其他磁盘的备份数据,由于parity的存在,硬盘的整体容量会减少一块,读写速度有所增强,安全性能够支持低于一块硬盘的损坏。 

Spare disk:备用磁盘可以在磁盘损坏时立刻替换损坏的磁盘进入工作状态。在损坏磁盘修复之后,损坏磁盘变成了备用磁盘。

Raid10和Raid01:是将raid0和raid1集合起来的一个方案,raid10是先将磁盘做镜像,再在镜像中将数据做条带化,raid01相反。保证了安全的同时还提高了性能,但是总体利用率都只要50%

磁盘阵列的命令:

mdadm -C /dev/md0 -l 5 -n 2 -x 1 /dev/sda{1,2,3}

-C创建 后面接raid名 -l等级 -n几块硬盘组成  -x备用磁盘  后面接组成raid的每一块设备。

mdadm -D可以检查raid设备状态 -S停止raid工作

Raid创建完成在格式化和挂载后就可以使用。

mdadm -f 标记一个磁盘故障 -r移除一个磁盘,-a添加一个磁盘

madam /dev/md0 -f /dev/sda1

可以在/proc/mdstat中查看raid的各种状态,如果还显示设备繁忙,可以根据一串神秘代码移除。

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"软磁盘阵列「建议收藏」磁盘阵列是指通过软件或者硬件的技术来将多个磁盘整合成为一个大的磁盘设备,来实现存储和保护数据的功能。硬件实现的成为硬磁盘阵列,软件实现称为软磁盘阵列,硬件通过磁盘阵列卡上的芯片专门处理raid任务,性能最佳。但由于成本太高大多使用软磁盘阵列,就是mdadm软件,以分区或者磁盘为单位来进行设计。Ra…", "datePublished": "2022-05-20T15:00:00+08:00", "dateModified": "2022-05-20T15:00:00+08:00", "author": {"@type":"Person","name":"全栈程序员-站长","url":"https://javaforall.net/user-2/1","image":"//javaforall.net/wp-content/uploads/2025/04/2025042212371781.jpeg"} } </script> </body> </html>